JL Audio Fathom SA-600W Owner's Manual page 34

f) A low rumbling noise sequence will be played through the subwoofer
system that sounds like distant thunder. The sequence will last
approximately 3 minutes. During this process, the D.A.R.O. system is
taking a frequency response measurement at your seat and correcting
the problems it finds. The D.A.R.O. system also compensates for any
before & after level differences so that your subwoofer will have a similar
perceived loudness after the calibration process. When D.A.R.O. is finished
calibrating, the "Calibrate" button will turn grey and the word "Calibrated"
will appear in green underneath, indicating a successful calibration.
To clear the D.A.R.O.'s settings (i.e., return them to flat) & turn off the
"Calibrated" indication, select "Clear DARO", then select "CONFIRM
CLEAR" to verify.
Should you wish to run a completely new calibration, simply repeat the steps
above. There is no need to erase the old calibration first. Any new calibration will
overwrite the existing data.
IMPORTANT! MAKE SURE THE ROOM IS QUIET DURING D.A.R.O.
CALIBRATION! TURN OFF ANY NOISY APPLIANCES NEAR THE LISTENING
ROOM (DISHWASHERS, WASHING MACHINES, ETC.).
IT IS PARTICULARLY IMPORTANT TO TURN OFF AIR CONDITIONERS OR HEAT
PUMPS DURING CALIBRATION. THESE FORCED-AIR-TYPE HVAC SYSTEMS
CAN CREATE MODERATE LEVELS OF 15 – 20 HZ NOISE THAT MAY INTERFERE
WITH CALIBRATION.
2) Level Setting (GAIN)
Using familiar music or movie material with deep bass content, adjust
the subwoofer level to blend with the other speakers using your receiver or
processor's subwoofer level control. This method is more immune to tampering
than using the SA-600W's "GAIN" control (think toddlers or curious visitors).
In the unlikely event that the subwoofer level control in your receiver or
processor cannot be turned up enough to level match the SA-600W, return that
control to "0". Then, switch the SA-600W's GAIN mode to VAR (Variable). With
"0" as your reference point (REF mode gain and VAR "0" gain are identical), use
the "VAR" control to level match the subwoofer with the other speakers.
3) POLARITY and DELAY (Phase) Adjustment
It is often helpful to have a second person operating these controls so that you
can easily hear the changes from the primary listening seat.
Listening to familiar source material (preferably music with good upper bass
and midbass response), switch the "POLARITY" from "0 deg" to "180 deg" and
listen for differences. The correct setting will sound most natural with the best
upper bass punch and articulation. If both sound similar, choose "0".
Once "POLARITY" is set, use the same music material to audition different
"Sub out DELAY" settings and choose the one that further enhances the
upper and midbass response. Delay is given in milliseconds. Note that the HP
out control only applies to the "HIGH PASS OUTPUTS" on the rear panel
(not applicable if only a sub is connected to the SA-600W). If you can't hear a
difference in various "DELAY" settings, set the control to "0."
Page 34
IMPORTANT
| Fathom SA-600W